2.共基电流分配关系: 123457 CB电流放大倍数:定义a=n/i(一般性的定义) 返回 CB直流电流放大倍数:a=(c-lc/~I/g(忽略IcBo CB输出端交流短路电流增益:α dn|"C数 C≈c=0.99< 所以i=ai+lCBo (反映运对i的控制作用) R C B b E LEP en E E2. 共基电流分配关系： CB 电流放大倍数：定义 α=icn1 / iE （一般性的定义） CB 直流电流放大倍数: =(IC-ICBO) / IE≈IC / IE（忽略 ICBO） CB 输出端交流短路电流增益： E c d i d i  = vCB=常 数 ≈ ＝0.99<1 所以 ic= iE+ICB0 (反映 iE对 ic的控制作用) EB EC RC b Rb c e ● ● ● ● iEP ib1 icn1 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ien iC iE iB iC iB icn2 icp 1 2 3 4 5 7 返回